Utilization of dilute Russell's viper venom time to detect autoantibodies against beta 2-glycoprotein I which express anticoagulant activity in the presence but not in the absence of exogenous phospholipids - Pengo, V; Balestrieri, G; Tincani, A; Spatola, L; Biasiolo, A; Brocco, T (Thromb Haemost, 1997)